169 
Capsules incompletely four-celled; calyx-tube with a lobed 
disk in its throat. "13. -EULosus. 
Capsules with complete septa; calyx-tube naked at the throat. 
14. SPHAEROSTIGMA. 
Ovaries and capsules long stalked, more or less club-shaped. 
15. CHYLISMA. 
Flowers irregular (the alternate stamens longer). 
Ovules and seeds numerous, not tuberculate, clustered on slender foniculi cap- 
sules club-shaped. 
Flowess yellow 
Flowers red, purple or white. 
Ovules and seeds few, sessile, in one or two rows. 
Plants normally acaulescent. 
Capsules obtusely or retusely four-angled; seeds with 
4. KNEIFFIA, 
5. HARTMANNIA. 
a deep furrow along the raphe, 6. PACHYLOPHUS. 
Capsules sharply four-angled; seeds with a tubercle 
at one end, 
7. LAVAUXIA, 
Plants caulescent. 
Stems diffuse and wiry; leaves 1-2 cm, long; cap- 
sules sharply four-angled. 8, GAURELLA. 
Stems not diffuse, stout; leaves 4-15 cm. long or 
longer; capsules broadly winged. 9g. MEGAPTERIUM. 
1. ONAGRA Adans. Fam. Pl. 2: 85. 1763. 
Plants annual or biennial. : 
Flowers small; petals 2-4 mm. broad. 1, O. cruciata. 
Flowers large; petals one or several centimeters broad. 
Calyx-tubes slender, 2.5-5 cm. long. 
Stems decumbent ; pubescence rather dense, short and 
appressed, ~ 2. O. depressa, 
Stems erect or nearly so. 
Pubescence villous-hispid, strigose or soft and appressed ; 
species ranging east of the Rocky Mountains. 
Capsules 2-2.5 cm. long, abruptly narrowed at the 
apex |» 3, O. biennis. 
Capsules 3-4 cm. long, gradually narrowed from near 
the base. 4. O. Oakesiana, 
Pubescence hirsute or canescent-hirsute ; species ranging : 
west of the Rocky Mountains. 5. O. Hookeri. 
Calyx-tubes stout, 6-13 cm. long : ae 
_ Leaves distantly toothed, minutely ciliate. 6. O. Famesit. 
Leaves entire, with short bristle-like cilia.. 7. O. macroceles, 
Plants perennial, 8. 0. arguta. 
I. “ONAGRA CRUCIATA (Nutt). 
OEnothera cruciala Nutt. ; Ser. in DG Prodt.: 3: 47- as 
Bi dash ghia eta 
